The reason people got eyes in the front of their heads is so they can always keep moving forward. So with each step they take, they can see that horizon coming closer, so they can see the backs of the others walking with them.

If we were supposed to care about all the shit that went wrong in the past, we would have eyes in the back of our heads. So stop worrying about that stuff. You made mistakes in the past? We all did. That's why you gotta keep moving forward. So you can make sure never to make those mistakes again.